Gas mask



Aug. 20,1929. A. a. DRAGER GAS MASK Filed Feb. 26, 1926 Patented Aug. 20, 1929.

UNITED STATES PATENT" OFFICE.-

ALEXANDER immvmn Damian, or nunnox, onmrmynnrmnn nnionn, m s'rmen, nxncu'rnix or sun nnienn, Dncnasnn, ASSIGNOB 'ro HEINRICH o'r'ro 1:31am, or LUBECK, enamanr.

GAS MASK.

Application filed February 26, 1926, Serial No. 90,762, and in Germany March 30, 1925.

The invention is'based upon the knowl edge that poor or insuflicient yisibility through gas protective masks is a source of danger which cannot be -too highly estimated, and which in certain circumstances increases to such an extent that the protective efit'ect aimed at is entirely lost to the wearer of the mask. In gas protective masks used heretofore andmade of pliable material having two circular eye-pieces or windows arranged either' in the same plane or at an obtuse angle thus allowing perspective vision, there is the drawback that the field'of view to the wearer is impaired in the downward direction, so that the wearer in order to look at his feet or on the ground must necessarily lower his head. The consequence is that the wearer in walking about is compelled to move his head continuously up and down. This has the eflect of giving the wearer such a feeling of uneasiness and 'uncertainty,,that, as experience proves, he is frequently induced to take the mask oif prematurely and thus to divest himself of the contemplated protection;

According to the invention this drawback of inadequate visual power in gas protective masks is avoided by the fact that instead of circular eyepieces made of glass, celluloid,-

cellulose or other suitable material use is made of eye-pieces of unequal'breadth and length arranged in such'manner that their longitudinal axes are in the direction ;of a line connecting the forehead and the chin.

i Therefore .oval or elliptical .eyeieces are used, preferably such of which t e outline corresponds to that of an egg, the broader part of the minor axis of the outline lying either below or above the eye. By providing eye-pieces of this shapethe wearer without lowering or inclined the head and merely-by correspondingly turning the eyes can look down to the ground whilst at the same time the general front view is in no way obstructe In theaccompanying drawin a constructional form of the invention 1s shown by wa of example.

ig. l is a front view of the mask as either precisely or approximately in the same plane and allow a normal perspective field of vision. These eye pieces are shaped similar to the outline of an egg, the longitudinal axis 0' being in the direction of a line connecting forehead and chin, the e es of the wearer lying in the upper part 0 the eyepieces. his egg-like or ovalshape may be given preference when the eye-pieces are attached in the wall of the mask by binding,

while a more lengthy shape is to be preferred when the eye-pieces are placed in metal mounts which are not connected in the wall of the mask .by binding but by other means, for instance by pressing.

In a gas protective mask, the combination of a body of pliable material, and a pair of ovate eye pieces fixed in said body with the smaller ends pointing downwar y and extending downwards sufliciently far to permit a substantial increase of visual angle in a downward direction, the major axis of said eye pieces being substantially vertical, said eye pieces being located in said body toposition the upper, largerend portions thereof in registry with the eyes of the wearer when the mask is worn. In testimony whereof Ihave signed my name to this specification.

- ALEXAINDER tal sman Duel-m. 

